Last week, The Port Authority of New York and New Jersey, which operates three airports, sent a letter to the head of TSA detailing that security wait times have "risen dramatically in recent months" which leads to delayed and missed flights.

The letter also threatened to hire private security workers if the TSA didn't increase the number of screeners at the airports.

The general manager of Atlanta's airport sent a similar letter in February .

The TSA has been boosting its hiring and training programs, and announced plans last week to add more security officers and dogs at the country's busiest airports.

Summer travelers can clog up the lines even more because they tend not to be as familiar with the security screening process.